boring head

A boring head is used to accurately cut a hole, face off a part, or cut grooves and rings. Usually it is employed in situations where the hole to be made is too large for a reamer, or which needs special geometry.

Machining an cotter for the armor milling machine averarm support

When I bought this mill it came with an overarm support but no means of holding it to the overarm proper. There was a hole through the support casting at a right angle to the overarm hole, and it was clear from looking at pictures of other peoples mills that there was supposed to be a cotter there to hold it in place. I decided to try and make a cotter to fit, and looked online for information on how to do it. Not much showed up, although I got enough detail to think I could figure it out.